Is WD-40 Safe for Spark Plugs? Understanding the Risks

Discover why using WD-40 on spark plugs is not recommended and learn the best maintenance tips for your engine.

Published Jul 23, 2025

Overview

Wondering if WD-40 is safe for spark plugs? In this informative video, we explore the effects of using WD-40 on spark plugs and why it's not advisable. While WD-40 is a well-known lubricant and cleaner, it can disrupt electrical connectivity in spark plugs, leading to engine misfires. Understanding the proper maintenance for your vehicle can help improve engine performance and longevity.

Video transcript

Yes, using WD-40 on spark plugs is not recommended. WD-40 is a lubricant and cleaner, which can interfere with the electrical connectivity of spark plugs, leading to misfires and poor engine performance. For proper maintenance, use a dedicated spark plug cleaner or replace the spark plugs according to your vehicle's maintenance schedule. This ensures optimal functioning and longevity of your engine.

Questions and answers

What happens if you use WD-40 on spark plugs?
Using WD-40 on spark plugs can interfere with electrical connectivity, leading to misfires and decreased engine performance.
What should I use to clean spark plugs?
For cleaning spark plugs, it's best to use a dedicated spark plug cleaner or to replace the spark plugs as per your vehicle's maintenance schedule.
Can WD-40 damage spark plugs?
Yes, WD-40 can damage spark plugs by affecting their ability to connect electrically, potentially resulting in engine issues.
How often should spark plugs be replaced?
Spark plugs should be replaced according to your vehicle's maintenance schedule, typically every 30,000 to 100,000 miles, depending on the type of spark plugs used.